The company's security officer has stated that for compliance reasons, all internal and external network traffic must be encrypted. Which additional type of encryption should the architect recommend?

SecureICA only encrypts the ICA traffic within the Citrix environment and does not cover all internal and external network traffic.

IPsec can encrypt network traffic but is a network layer protocol and not typically the primary method for end-user application session encryption in a Citrix context, nor does it specifically cover external web traffic like SSL.

SSL (Transport Layer Security - TLS) is typically used to encrypt external traffic, such as connections to a Citrix Gateway, while SecureICA encrypts the data stream between the user device and the virtual app/desktop within a Citrix environment, ensuring end-to-end encryption.

L2TP is a tunneling protocol often used in VPNs but is not the specific application-layer encryption for Citrix sessions or the standard for securing external web traffic.